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US 4,552,530 AGranted
Ring section baking furnace and procedure for operating same
AssigneeArdal og Sunndal Verk a.s.
InventorsKare Gunnes, Tormod Naterstad, Olav Lid
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AssigneeArdal og Sunndal Verk a.s.
InventorsKare Gunnes, Tormod Naterstad, Olav Lid
Estimating the term…
A ring section baking furnace for the indirect heating of shaped bodies or particulate material, particularly for calcination, includes vertical ducts, or channels, in pit walls arranged in groups by means of partition walls under the bottom of the pits. Flue gases are led up and down through these ducts. Combustion chambers are not provided, and the volume thereof otherwise required is incorporated into the pit volume. The ducts in each pit wall lead out over the pit wall into one or more separate rooms which connect, in series, two neighboring groups in this pit wall. A small cover plate is provided over each pit wall. Compared with earlier designs with the same external dimensions, less refractory brick is required, a more even temperature of the calcined material is achieved, the consumption of fuel is reduced and the capacity increased.
In a ring section furnace of the type including a plurality of sections connected in series, each said section comprising a plurality of parallel pits defined by spaced parallel pit walls, and vertical ducts provided in each said pit wall, with flue gases being passed through said ducts to achieve heat treatment by indirect heat exchange with material to be treated placed in said pits, the improvement comprising:
The improvement claimed in claim 7, wherein each said pit wall has therebeneath a lower space, and said means comprises a partition wall dividing each said lower space into first and second lower chambers respectively connected to first and second said groups of ducts.
In a process for heat treating material to be treated by the operation of a ring section furnace of the type including a plurality of sections connected in series, each said section comprising a plurality of parallel pits defined by parallel pit walls, and vertical ducts provided in each said pit wall, said process comprising positioning said material in said pits, combusting a fuel to form flue gas, and passing said flue gas through said ducts, thereby treating said material by indirect heat exchange, the improvement comprising:
Dependencies are inferred from the claim text.